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Phrase(s): Every little bit helps.
Prov. Even the smallest amount is helpful. • Tom: I can only give a dollar to your charity. Mary: That’s OK. Every little bit helps. • Jane gave me a pair of booties for my new baby. It’s not much, but every little bit helps.
McGrawhill's American Idioms And Phrasal Verbs
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Any contribution can be useful, as in He can only give us one day, but every little bit helps. This expression, with slightly different wording (everything helps), dates from the late 1500s.
American Heritage Idioms